Adds ability to deploy from upstream openstack

To deploy with upstream openstack branch, use new deploy setting 'os_version'.
A default scenario file for nosdn with pike has been included in this patch.
If 'os_version' is a version other than the default version for this OPNFV
release, then upstream is used.

In order to use upstream with the current OS version use '--upstream'
argument to the deploy command, to force an upstream deployment.

Also include '-e upstream-environment.yaml' to use default upstream
deployment settings.

Supports nosdn and odl-nofeature deployments.

Change-Id: Ic07e308827b449637b4e86cdd086434e4de2fb69
Signed-off-by: Tim Rozet <trozet@redhat.com>